JPS6317567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for cutting steel pipe sheet piles driven into underwater ground or the like at a predetermined level.

[Conventional technology and its problems]

Conventionally, typical methods for cutting steel pipe sheet piles underwater include a disc cutter method, a grindstone cutter method, an oxygen arc cutting method, and the like. However, among these methods, the disc cutter method and the grindstone cutter method can properly cut the main sheet pile (steel pipe part), but if you try to cut to the joint part, the cutting will be interrupted in the circumferential direction of the steel pipe sheet pile, which may cause damage to the cutter. . In addition, sealing material is filled inside the joint, but
When cutting the joint, the cutting resistance between the sealing material and the steel part (joint body) is different, which can also cause damage to the cutter. In addition, with the oxygen arc method, if concrete or rust adheres to the planned cutting position, there is a problem that the arc may break midway or become a hindrance to arc generation. It is necessary to remove it in advance, and cutting the joint portion as described above is difficult especially in relation to such deposits.

In all of these conventional methods, it is virtually difficult to cut the joint, and for this reason, it is recommended that the joint be pre-cut in some way based on the cutting position of the main sheet pile. Normal. However, due to problems with the ground, etc., the cutting position of the main sheet pile may deviate from the expected position, and in this case, the meaning of the above-mentioned pre-cut is lost, and the steel pipe sheet pile above the cutting position cannot be pulled out. .

The present invention has been made in view of the problems of the conventional method, and it is an object of the present invention to provide a device that can appropriately cut the joint portion as well as the sheet pile main pipe.

[Means and actions to solve the problem]

For this reason, the present invention employs a method that combines a cutter cutting method and a waterjet cutting method, and has the following specific configuration. That is, the present invention has a main body and a plurality of contact members movable in the circumferential direction and vertical direction of the main body, and each contact member is pressed into contact with the inner wall of the steel pipe sheet pile so as to be able to come into contact with and separate from the inner wall of the steel pipe sheet pile. A holding means to be held on the inner wall, a rotating body rotatably held in the center of the main body, and a rotational drive device for the rotating body;
A horizontal moving body provided horizontally movably at the bottom of the rotating body, a cylindrical body provided on the horizontal moving body so as to be horizontally rotatable and slidable up and down, and a rotation drive device for the cylindrical body provided on the horizontal moving body. , a disk-shaped cutter fixed to the outer periphery of the cylindrical body, a nozzle holder having a female screw portion at the upper end and rotatably held inside the cylindrical body, and a nozzle holder perpendicular to the fixed part on the horizontally moving body side. A lifting drive device for a cylindrical body/nozzle holder, which comprises a screw shaft which is rotatably held and is screwed into the female threaded portion from the lower end side thereof, and a motor for driving the rotation of the screw shaft provided on the horizontally movable body. , a water jet nozzle provided at the lower end of the nozzle holder so as to be horizontally movable; a cylinder device for driving the water jet nozzle slide, one end of which is attached to a rotating body or a horizontal moving body so as to be vertically slidable; Its basic feature is that it consists of a fluid supply means for supplying fluid such as high-pressure water to the jet nozzle from outside the device.

In the apparatus of the present invention, the sheet pile main pipe is basically cut with a disc-shaped cutter, and the joint part is cut with a water jet nozzle. The main body of the apparatus is suspended from the upper end of the main sheet pile pipe, and is held at an arbitrary height within the main pipe by pressing each contact member serving as a holding means against the inner wall of the main pipe. The cylindrical body and the nozzle holder are moved up and down by the lifting drive, and the cutting positions of the disc cutter and water jet nozzle are adjusted and the cutting levels of both cutting means are shifted. When cutting the main sheet pile with a disc-shaped cutter, the cutter is rotated by a rotary drive device of the cylindrical body to which the cutter is fixed, and the horizontal moving body is moved in the horizontal direction to move the cutter into the main sheet pile. By making a cut in the wall and further rotating the rotating body using a rotation drive device, the horizontal moving body is rotated to cut the main sheet pile in the circumferential direction. On the other hand, when cutting a joint with a water jet nozzle, after cutting the main sheet pile, the water jet nozzle is shifted to the cutting position by the lifting drive device, and high pressure water, abrasive, etc. are supplied to the water jet by the fluid supply means. While supplying the material to the nozzle, the horizontal moving body is rotated within a predetermined range by the rotating drive device to cut the joint portion.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The device of the present invention includes a main body 1, a holding means 2 for holding and fixing the main body to the inner wall of a main sheet pile pipe, a rotating body 3 rotatably held on the main body, a rotation drive device 4 for the rotating body, and a rotating body. A horizontal movable body 5 provided horizontally movably at the lower end of the horizontal movable body, a cylindrical body 6 disposed on the horizontal movable body so as to be horizontally rotatable and slidable up and down, a rotation drive device 7 for the cylindrical body, and a rotation drive device 7 attached to the cylindrical body. a cutter 8, a nozzle holder 9 rotatably held inside the cylindrical body, a lifting drive device 10 for the cylindrical body/nozzle holder, and a water jet provided at the lower end of the nozzle holder so as to be movable horizontally. nozzle 11,
A cylinder device 12 for driving the water jet nozzle slide, and a fluid supply means 1 for supplying fluid to the water jet nozzle from outside the device.
It consists of 3.

The main body 1 has support parts 14, 1 at the upper and lower parts.
5.

The holding means 2 has a plurality of abutting members 16 that can move forward and backward in the radial direction of the main body 1 at a plurality of locations in the circumferential direction and the vertical direction of the main body 1. In this embodiment, each contact member 16 is driven by a hydraulic device 17, and is arranged at four locations in the circumferential direction of each of the upper and lower support portions 14 and 15 of the main body 1.

The rotating body 3 has a cylindrical shape, is disposed vertically in the center of the main body 1 with its lower end protruding from the lower part of the main body, and is rotatably held via a bearing 18.

The rotation drive device 4 is attached to a large gear 3 fixed to the outer periphery of the rotation body 3, a motor 20 fixed to a support base 14 at the upper part of the main body 1, and an output shaft 21 of the motor 20. It is composed of a small gear 22 that meshes with a gear 19.

The horizontal moving body 5 is constituted by a frame body, and the horizontal frame 2 is fixed to the lower end of the rotating body 3.
3 so that it can slide horizontally. In order to slide the horizontal moving body 5, a cylinder device 24 is attached to the horizontal frame 23, and a rod 25 thereof is connected to the horizontal moving body 5.

The cylindrical body 6 has a distal end side of the horizontal moving body 5,
Bearings 26a and 26b pass through this vertically.
It is held horizontally rotatable through. Further, a gear 27 is fitted onto the cylindrical portion of the horizontally movable body 5 that protrudes from the top.

The cylindrical body 6 can slide up and down with respect to the horizontal moving body 5, and therefore, the cylindrical body 6 can slide in the axial direction with respect to the gear 27 and the inner rings of the bearings 26a, 26b. These members are prevented from rotating relative to each other via keys, keyways, and splines. In this embodiment, a keyway 28 is provided in the longitudinal direction of the cylindrical body 6,
Keys are provided in the mounting hole of the gear 27 and the inner surface of the bearing inner ring, respectively.

The rotation drive device 7 is fixed to the gear 27 provided on the cylindrical body 6, a motor 29 fixed to the upper part of the horizontal moving body 5, and an output shaft 30 of the motor, and meshes with the gear 27. It is composed of a gear 31.

The disc-shaped cutter 8 constitutes one of the cutting means in the apparatus of the present invention, and is fixed to the outer periphery of the lower end of the cylindrical body 6. As this cutter, an appropriate disk-shaped cutter such as a disk cutter, a grindstone cutter, a sawtooth cutter, a diamond cutter, etc. can be used.

The nozzle holder 9 is connected via a bearing 32,
It is rotatably held inside the cylindrical body 6 with its lower end protruding from the lower part of the cylindrical body. This nozzle holder 9 has a female threaded portion 33 on its upper side.

The lifting drive device 10 is vertically and rotatably held via a bearing (not shown) on a suitable pedestal 34 provided on the upper part of the horizontal moving body 5, and the female screw of the nozzle holder is connected from the lower end side thereof. It consists of a screw shaft 35 screwed into a portion 33 and a motor 36 for rotating the screw shaft. The power shaft 37 from the motor side and the screw shaft 35 are connected through bevel gears 38 and 39. Further, a clutch 41 is provided between the motor output shaft 40 and the screw shaft 35 to cut the edge between the screw shaft 35 and the motor side when the cutter is used.

The water jet nozzle 11 constitutes the other cutting means in the device of the present invention, and a slide metal fitting 42 is attached to the nozzle body.
It is provided so as to be horizontally slidable on a slide base 43 fixed to the lower end of the nozzle holder 9 via the slide hardware 42 . Slide base 4
3 and the slide hardware 42 are slidably fitted together via a fitting groove or the like.

Figure 3 shows the cross-sectional structure of the nozzle body.
A nozzle hole 44 is formed at the tip, and a high-pressure water supply port 45 and an abrasive supply port 46 are separately provided at the rear.

The cylinder device 12 has an end portion of its main body 47 pivoted 50 so as to be vertically movable to a slide metal fitting 49 that is vertically slidably provided on a slide base 48 that is vertically disposed at the lower end of the rotating body 3. , the tip of the rod 51 is pivoted 52 to the rear end of the water jet nozzle 11 so as to be movable up and down,
The expansion and contraction of the rod 51 allows the water jet nozzle 11 to move forward and backward in the radial direction of the main body of the apparatus.
This cylinder device 12 moves the water jet nozzle 11 forward and backward, and when the cylindrical body 6 rotates when the disc-shaped cutter 8 is used, the nozzle holder 9 and the water jet nozzle 11 are moved forward and backward.
The function is to lock these so that they do not rotate.
The slide base 48 and the slide hardware 49 are also slidably fitted together via a fitting groove or the like.

Note that a slide base, which is a mounting portion of the cylinder body 47, can be provided on the horizontal moving body 5.

The fluid supply means 13 is constituted by a flexible hose, and the hose is led from outside the device (outside the steel pipe sheet pile) through the inside of the cylindrical rotating body 3 and the like to the water jet nozzle 11 and connected thereto. .
Although not shown, two types of hoses are used: one for high-pressure water and one for abrasive (abrasive material).

In other drawings, reference numeral 53 denotes a suspension rope for suspending or hoisting the entire apparatus within the main sheet pile pipe, and is connected to the upper part of the main body 1. Further, 54 is a slide bearing for supporting the gear 27 on the horizontal moving body 5.

Note that a plurality of the horizontal moving bodies 5 and associated cutters, nozzles, etc. can be provided along the circumferential direction of the main sheet pile pipe.

Next, how to use the device of the present invention will be explained.

The basic method of using the apparatus of the present invention is to cut the sheet pile main pipe with the disc-shaped cutter 8 and to cut the joint part with the water jet nozzle 11.

The device A is suspended from the upper end of the sheet pile main pipe A by a hanging rope 53 to the intended cutting position inside the main pipe A. At this position, each contact member 16 constituting the holding means 2 is pushed out by the hydraulic device 17 and pressed against the inner wall a of the sheet pile main pipe A, thereby holding and fixing the device A to the inner wall a.

In this state, fine adjustment of the level of cutting by the disc-shaped cutter 8 is performed. That is, the clutch 41 is operated by the motor 36 of the lifting drive device 10.
The screw shaft 35 is rotated through the bevel gears 38 and 39, and as a result, the cylindrical body 6 and the nozzle holder 9 are moved up and down while sliding with respect to the horizontal moving body 5, and the cutter position is adjusted. Adjustments will be made. With conventional equipment, such level adjustment of the cutting position had to be done by releasing the holding means and raising and lowering it using a hanging rope, which took a long time to adjust.
In the device of the present invention, the level can be adjusted while the device main body is fixed to the inner wall, and the adjustment work can be done in a short time.

Next, the cutting operation begins, and for this purpose, the rotation drive device 7 rotates the disc-shaped cutter 8 via the cylindrical body 6, and the cylinder device 24 moves the horizontal moving body 5 in the horizontal direction to cut the disc-shaped cutter. 8 is cut into the inner wall of the sheet pile main pipe A, and the rotary body 3 is further rotated by the rotary drive device 4, so that the disk-like shape held by the horizontal movable body 5 and the cylindrical body 6 is The cutter 8 is rotated to cut the main sheet pile in the circumferential direction.

Next, in order to cut the joint portion with the water jet nozzle 11, the disc-shaped cutter 8 and the water jet nozzle 11 are shifted in the vertical direction. That is, the nozzle holder 9 (and the cylindrical body 6) is raised by the elevating drive device 10 to align the water jet nozzle 11 to the cutting position level, and also to perform alignment in the circumferential direction of the main sheet pile pipe. Furthermore, the nozzle body is moved forward and backward by the cylinder device 12 to bring it close to a predetermined position relative to the cutting location. Then, the fluid supply means 13 supplies the water jet nozzle 11 with high pressure water (3000 to 4000
Kg/ ^cm2 ) and abrasive, and injecting the mixed fluid from the nozzle hole 44,
By rotating the rotating body 3 by the rotation drive device 4, the nozzle is rotated within a predetermined range to cut the joint portion.

High-pressure water and abrasive are fed under pressure to the nozzle via a supply means 13 by a pressure intensifier installed on the ground.

In such a cutting method of the present invention, since the cutting means is a high-pressure fluid injected from a nozzle, the joint portion can be appropriately cut.

In the present invention, any fluid can be selected as the fluid for the water jet nozzle; for example, high-pressure water itself can be used as the cutting fluid.

〔Effect of the invention〕

According to the present invention described above, the cutter with a high cutting speed is used as the cutting means for the main sheet pile pipe, and the water jet nozzle that injects high pressure fluid is used as the cutting means for the joint part, and these switching and It has the advantage of being able to properly rotate along the inner surface of the steel pipe sheet pile, and also being able to adjust the level for cutting while the main body of the device remains fixed to the inner wall of the main sheet pile. There is no need to pre-cut the joint part, and cutting work can be performed efficiently and reliably by simply performing level adjustment work in a short time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a partially enlarged view of section Y in FIG. 1, and FIG. 3 is a partially enlarged view of the nozzle body. In the figure, 1 is the main body, 2 is the holding means, 3 is the rotating body, 4 is the rotation drive device, 5 is the horizontal moving body, 6 is the cylindrical body, 7 is the rotation drive device, 8 is the cutter, and 9 is the nozzle holder. body, 11 is a water jet nozzle;
12 is a cylinder device, 13 is a fluid supply means, 16
33 is a female screw portion, 35 is a screw shaft, and 36 is a motor.

Claims (1)

[Claims] 1 The main body should have a main body and abutting members that can move forward and backward at multiple locations in the circumferential direction and the vertical direction of the main body, and the main body should be held against the inner wall of the steel pipe sheet pile by pressing each abutting member into contact with the inner wall of the steel pipe sheet pile so that they can come into contact with and separate from the inner wall of the steel pipe sheet pile. A holding means, a rotating body rotatably held in the center of the main body, a rotation drive device for the rotating body, a horizontal moving body provided horizontally movable at the bottom of the rotating body, and the horizontal moving body A cylindrical body that is horizontally rotatable and slidable up and down, a rotation drive device for the cylindrical body that is installed on the horizontally movable body, a disc-shaped cutter fixed to the outer periphery of the cylindrical body, and a female screw at the upper end. a nozzle holder, which is rotatably held inside the cylindrical body; and a screw, which is vertically and rotatably held by a fixed part on the horizontal moving body side and screwed into the female thread part from its lower end. an elevating drive device for a cylindrical body/nozzle holder consisting of a motor for rotating a screw shaft provided on a shaft and a horizontal moving body; a water jet nozzle provided at the lower end of the nozzle holder so as to be movable in a horizontal direction; A cylinder device for driving a water jet nozzle slide whose one end side is attached to a rotating body or a horizontal moving body so as to be able to slide up and down, and a fluid supply means for supplying fluid such as high pressure water to the water jet nozzle from outside the device. A cutting device for steel pipe sheet piles.